使用While重写PHP代码片段，每个列表可以使用Foreach或更简单的方式[关闭]

Question

I have following code snippet but i dont understand what its do, but i think there is easy way to write this code again with a simple foreach like below, is that correct ?

        $paypal_message="";
while( @list($key,$value) = @each($paypal_post_vars)) {
    $paypal_message .= $key.":\t".$value."
";
    if($key!='custom'){
        $insert_sql.=" `".$key."`='".$value."' , ";     
    }
 }

I think rewrite it like this ? is it exactly the same ?

foreach($paypal_post_vars as $key=>$value ){

    $paypal_message .= $key.":\t".$value."
";

    if($key!='custom'){
            $insert_sql.=" `".$key."`='".$value."' , ";     
        }

}

Answer 1

Yes, this is functionally identical code, if you look at php site - control structures foreach have the explanation below

You may have noticed that the following are functionally identical:

<?php
$arr = array("one", "two", "three");
reset($arr);
while (list(, $value) = each($arr)) {
    //     ^^ supressing key
    echo "Value: $value<br />
";
}

foreach ($arr as $value) {
    echo "Value: $value<br />
";
}

The following are also functionally identical:

<?php
$arr = array("one", "two", "three");
reset($arr);
while (list($key, $value) = each($arr)) {
    echo "Key: $key; Value: $value<br />
";
}

foreach ($arr as $key => $value) {
    echo "Key: $key; Value: $value<br />
";
}